MacLennan, competing for the first time since winning her first world title last November in Sofia, Bulgaria, topped the field in the women's final to finish with a total of 102.725 points, including the scores from Saturday's qualification.
Samantha Sendel of Toronto finished second and Samantha Smith of Toronto was third.
"I just wanted to put down a decent score for the beginning of the year to get that out of the way," said Sendel. "Rosie and I push each other a lot more in training now. We both want those bigger routines."
Burnett, the silver medal winner from the 2008 Beijing Olympics and seven-time Canadian champion, breezed to victory in the men's event in his first major outing in over six months, winning gold with a total of 169.725 points.
Keegan Soehn of Red Deer, Alta, won silver and Curtis Gerein of Kelowna, B.C., took the bronze. Soehn also won a gold medal in the double mini to cap a strong two-event performance.